diff --git a/repo/format/content_format.go b/repo/format/content_format.go
index cb0845fd9..a49e21fc2 100644
--- a/repo/format/content_format.go
+++ b/repo/format/content_format.go
@@ -63,10 +63,10 @@ func (f *ContentFormat) SupportsPasswordChange() bool {
 // MutableParameters represents parameters of the content manager that can be mutated after the repository
 // is created.
 type MutableParameters struct {
-	Version         Version          `json:"version,omitempty"`         // version number, must be "1", "2" or "3"
-	MaxPackSize     int              `json:"maxPackSize,omitempty"`     // maximum size of a pack object
-	IndexVersion    int              `json:"indexVersion,omitempty"`    // force particular index format version (1,2,..)
-	EpochParameters epoch.Parameters `json:"epochParameters,omitempty"` // epoch manager parameters
+	Version         Version          `json:"version,omitempty"`      // version number, must be "1", "2" or "3"
+	MaxPackSize     int              `json:"maxPackSize,omitempty"`  // maximum size of a pack object
+	IndexVersion    int              `json:"indexVersion,omitempty"` // force particular index format version (1,2,..)
+	EpochParameters epoch.Parameters `json:"epochParameters"`        // epoch manager parameters
 }
 
 // Validate validates the parameters.
diff --git a/repo/format/upgrade_lock_intent.go b/repo/format/upgrade_lock_intent.go
index 8b9e9fd9f..a65191ab9 100644
--- a/repo/format/upgrade_lock_intent.go
+++ b/repo/format/upgrade_lock_intent.go
@@ -13,7 +13,7 @@
 // repository.
 type UpgradeLockIntent struct {
 	OwnerID                string        `json:"ownerID,omitempty"`
-	CreationTime           time.Time     `json:"creationTime,omitempty"`
+	CreationTime           time.Time     `json:"creationTime"`
 	AdvanceNoticeDuration  time.Duration `json:"advanceNoticeDuration,omitempty"`
 	IODrainTimeout         time.Duration `json:"ioDrainTimeout,omitempty"`
 	StatusPollInterval     time.Duration `json:"statusPollInterval,omitempty"`
diff --git a/repo/object/indirect.go b/repo/object/indirect.go
index 252e6c181..48e499ab7 100644
--- a/repo/object/indirect.go
+++ b/repo/object/indirect.go
@@ -4,7 +4,7 @@
 type IndirectObjectEntry struct {
 	Start  int64 `json:"s,omitempty"`
 	Length int64 `json:"l,omitempty"`
-	Object ID    `json:"o,omitempty"`
+	Object ID    `json:"o"`
 }
 
 func (i *IndirectObjectEntry) endOffset() int64 {
diff --git a/snapshot/manifest.go b/snapshot/manifest.go
index 7352314fc..87228ecd4 100644
--- a/snapshot/manifest.go
+++ b/snapshot/manifest.go
@@ -126,7 +126,7 @@ type DirEntry struct {
 	ModTime     fs.UTCTimestamp      `json:"mtime,omitempty"`
 	UserID      uint32               `json:"uid,omitempty"`
 	GroupID     uint32               `json:"gid,omitempty"`
-	ObjectID    object.ID            `json:"obj,omitempty"`
+	ObjectID    object.ID            `json:"obj"`
 	DirSummary  *fs.DirectorySummary `json:"summ,omitempty"`
 }
 
@@ -187,8 +187,8 @@ func (m *Manifest) Clone() *Manifest {
 type StorageStats struct {
 	// amount of new unique data in this snapshot that wasn't there before.
 	// note that this depends on ordering of snapshots.
-	NewData      StorageUsageDetails `json:"newData,omitempty"`
-	RunningTotal StorageUsageDetails `json:"runningTotal,omitempty"`
+	NewData      StorageUsageDetails `json:"newData"`
+	RunningTotal StorageUsageDetails `json:"runningTotal"`
 }
 
 // StorageUsageDetails provides details about snapshot storage usage.